I believe this concept came from the PeopleWare book by Demarco/Lister. Its common sense that for work requiring deep periods of concentration, eliminating dis

I believe this concept came from the PeopleWare book by Demarco/Lister. Its common sense that for work requiring deep periods of concentration, eliminating distractions is key. Easiest way to eliminate distractions in an office environment is being in a room behind a closed door. Cheapest way to do that these days is WFH, assuming people have that space where they live.